Deuterium trapping at vacancy clusters in electron/neutron-irradiated tungsten studied by positron annihilation spectroscopy

T. Toyama, K. Ami, K. Inoue, Y. Nagai, K. Sato, Q. Xu, Y. Hatano

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Deuterium trapping at irradiation-induced defects in tungsten, a candidate material for plasma facing components in fusion reactors, was revealed by positron annihilation spectroscopy. Pure tungsten was electron-irradiated (8.5 MeV at ∼373 K and to a dose of ∼1 × 10−3 dpa) or neutron-irradiated (at 573 K to a dose of ∼0.3 dpa), followed by post-irradiation annealing at 573 K for 100 h in deuterium gas of ∼0.1 MPa. In both cases of electron- or neutron-irradiation, vacancy clusters were found by positron lifetime measurements. In addition, positron annihilation with deuterium electrons was demonstrated by coincidence Doppler broadening measurements, directly indicating deuterium trapping at vacancy-type defects. This is expected to cause significant increase in deuterium retention in irradiated-tungsten.

Original languageEnglish
Pages (from-to)464-470
Number of pages7
JournalJournal of Nuclear Materials
Volume499
DOIs
Publication statusPublished - 2018 Feb

Keywords

  • Fusion materials
  • Hydrogen trapping at defects
  • Positron annihilation spectroscopy
  • Tungsten

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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